I am confused the thread title says "replica" which in my mind = counterfeit. But in the post you say "similar" which in my mind = similar in appearance. I would not buy anything that is known to be counterfeit. Now if it is similar who is the manufacture? Has it passed the required testing?

An expensive helmet does not mean that it is safer than an inexpensive helmet. They both passed the same minimum safety test. I could actually argue that the more expensive helmet may be less safe because it has more weight saving. Just by the look and feel I would say that a BMX / skateboard helmet is safer than a road bike helmet. But you don't see me wearing one of those.

I have also never seen an expensive helmet claim to be more safe. If it was they would market that. They justify the expense on weight, aerodynamics, ventilation and style.